For the MOS differential pair with a common-mode voltage VM applied, as shown in Fig. 8.2, let VDD = V=1.5 V, k(W/L) = 4 mA/V, V = 0.5 V, I = 0.4 mA, and R, = 2.5 k2, and neglect channel-length modulation. Assume that the current source I requires a minimum voltage of 0.4 V to operate properly. (a) Find Voy and Ves for each transistor. GS (b) For V solutionspile.com

Question

For the MOS differential pair with a common-mode voltage VM applied, as shown in Fig. 8.2, let VDD = V=1.5 V, k(W/L) = 4 mA/V, V = 0.5 V, I = 0.4 mA, and R, = 2.5 k2, and neglect channel-length modulation. Assume that the current source I requires a minimum voltage of 0.4 V to operate properly. (a) Find Voy and Ves for each transistor. GS (b) For V=0, find Vs In I VDI and V (c) Repeat (b) for VCM +1 V. (d) Repeat (b) for VM=-0.2 V. CM (e) What is the highest permitted value of VM? (f) What is the lowest value allowed for Va? UGI |1? DI O RD VIDI 2? VIDI VDD iD2 V D2 A {R 9? RD OUD2 VG2

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V_{S} = 1.5 V, k_{n}^{?} (W / L) = 4 mA / V^{2}, V_{i} = 0.5 V, I = 0.4 mA

, and

R_{D} = 2.5 k ?

, and neglect channel-length modulation. Assume that the current source

I

requires a minimum voltage of

0.4 V

to operate properly. (a) Find

V_{or}

and

V_{OS}

for each transistor. (b) For

V_{CO} = 0

, find

V_{S} I_{D 1}, I_{D 2}, V_{D 1}

, and

V_{D 2}

. (c) Repeat (B) for

V_{CM} = + 1 V

. (d) Repeat (b) for

V_{Cr} = ? 0.2 V

. (e) What is the highest permitted value of

V_{Ca}

? (f) What is the lowest value allowed for

V_{cr}

?

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